Machine for working cement concrete



Jan. 15, 1935. c, JAcKsoN MACHINE FOR WORKING CEMENT CONCRETE Filed Aug. is, 1930 2 Sheets-Sheet l INVENTOR Corn/ZZZ dZckson BY 675M415 P (fa/z! ATTORNEY: I

Jan. 15, 1935. c. JACKSON 1,988,315

MACHINE FOR WQRKING CEMENT CONCRETE Filed Aug. 16, 1950 2 Sheets-Sheet 2 1 NVENTOR Com/ZZZ Jackson BY 625% r 5%! A TTORNEY- Patented Jan. 15, 1935' I i I UNITED STATES PATENT OFFICE 1,988,315 MACHINE FOR WORKING CEMENT J oonoac'rn N Corwill Jackson, Chicago, Ill. Application August-1'6, 1930, Serial No. 415,774 8 Claims. ('01. 25-1) The main objects of this invention are:, 1n,the embodiment shown in Figs. 1 and 2-the First, to provide a machine for working and finshoe and side plate are formed ofwood and have ishing concrete in the laying of floors, pavements, metal facings 5. In this embodiment, and in the gutters, conduits, drains or the like. V embodiment shown in Fig. 4, .1 show apair of 5 Second, to provide a machine for working vibrating units arranged toward the end of the 5 cement concrete which greatly facilitates the shoe. The handles 6.are provided with bar-"like placing of concrete and permits the' use of relgrips 7. 'Thesehandles are upwardly and outatively dry concrete mixtures. wardly curved and formed of springs. v

Third, to provide a machine of this character A draft means 8 is attached to the 'side plate in to which enables the very rapid placing of the conspaced relation to its lower edge. I 10 crete with a minimum of labor. In Fig. 1, 9 represents the formandlO repre- Objects pertaining to details and economies of sents the concrete which is being worked. my invention will definitely appear from the de- In use the concrete is placed within the form, tailed description to follow. The invention is depreferably roughly dumped therein as shown in fined in the claims. Fig. 3, and the machine placed uponthe mass with 15 A structure which embodies the features of my the vibrating units in operation. The concrete invention isclearly illustrated in the accompanymixture is preferably what is known as a dry ing drawings, in which: harsh mixture, that is, there is insufilcient mois- Fig. 1 is a front elevation of 'my concrete workture to permit the concrete to flow into place or '20 mg machine in operative relation to a form and even to be readily tamped. The vibrating units a bed of concrete, the parts being shown in suroperate at relatively high speed with the result I face finishing position. that the character of the concrete mixture is Fig. 2 is an enlarged fragmentary view'inverchanged so that it readily flows into place and tical section on line 2-2 of Fig. 1. voids are eliminated, even where a very coarse Fig.3 is a view similar to that of Fig. 1 illustrataggregateis employed, nd thi ith no m r 25 ing one of "the earlier stages of the working of the -moisture than is necessary to produce the best concrete mass. results. v J

Fig. 4 is a front elevation of a slightly modifi d After the character of the 'mass has thus been form or embodim nt f my in n i illustrating changed the machineis used in finishing the suranother method of sin the ha d s being face and drawn along bythe cable 8, riding upon 30" omitted. the upper edges of the forms, thereby serving as a F 5 s a r a elevation of y p d m n straight-edge and finishing means and further viconcrete working machine as adapted or embodied brating th "ma being work d, or the u d 0f trenfihes Shown in Operative In the modification shown in Fig. 4 the shoe 11 relation to-a form and a mass of c n e is straight and rests upon the mass of concrete 12 35 I have illustrated my improvements as I have b twee the forms, I embodied h same r h y 0f p l n t In the embodiment shown in Fig. 5 the shoe is floors of considerable area an for e W ing provided with horizontal end portions 13, a horiof trenches' zontal downwardly offset central portion 14 and 40 40 The embodiment shown 1 compnses P upwardly diverging intermediate portions 15. Shoe} Shghtly .cmwned toward the center Thls The lower edge of the side wall 16 is conformed shoe is of considerable length and of such width to the sha e of shoe This machine is that the face of the shoe may be applied to a mass 1 I pecially designed for the formmg of concrete of concrete to be worked and 1s capable of suptrenches, the concrete being indicated at 1'7 and porting the machine on the mass, that 1s,,1t does not enter the mass materially but is applied to it' the form at The method of is the Same and Supported on the urfa e thereot -*as that described, theshoe being merely adapted d t t fr ed 8 f to the surface of the finished work. maxe pioieft sgw srdfy t ref gm 'ngs I have not attempted to illustrate'certain other side plate reinforces the'shoe and also constitutes i e s 6r ad a of yi p v e ts so a mounting for the vibrating units 3. These vi-' as it is believed thatthisdisclosurewillenable those brating units are electric motors having shafts skilled in the art to which my invention relates to 4 with unbalancing weights thereon, the units embody or adapt the sametaissllnzay be desiretd. being mounted on the side plate so that the shafts It is desired to point on a my presen mare transverse to the shoes. provements are a development of the invention 5 of my application for Letters Patent filed December 12, 1927,Serial No. 239,568..

Having thus described my' invention what I claim as new and desire to secure by Letters Patent is:

1. In a machine for working concrete, the combination of an elongated shoe or screed adapted to be applied directly to and supported by a mass of concrete to be worked or to rest and be manipulated upon the forms for the concrete, and comprising horizontal end portions and a horizontal central portion, said end and central portions being connected y upwardly diverging intermediate'portions of substantial length, a side plate fixed to the front edge of said shoe or screed to project upwardly therefrom throughout the length thereof, handles at the ends of said shoe or screedfor manually manipulating the same,

, and a vibrating means comprising a motor having an unbalancing weight carried by said shoe or screed.

2. In a machine for working concrete, the combination of an elongated shoe or screed adapted to be applied directly to and supported by a mass '01 concrete to be worked or to rest and be manipulated upon the forms for the concrete and comprising horizontal end portions and a horizontal central portion, said end and central portions being connected by upwardly diverging intermediate portions'of substantial length, handles attached to said shoe or screed at the ends thereof and projecting outwardly and upwardly therefrom, and vibrating means comprising a motor having an unbalancing weight carried by said shoe or screed.

3. In a machine for working concrete, the com- -bination of an elongated shoe or screedadapted be applied directly to and supported by a mass of concrete to be worked or to rest and be reciprocated upon forms forthe concrete, a side plate fixed to the front' edge of said shoe or screed to project upwardly therefrom throughout the length thereof, handles at the ends of said shoe or screed for manually manipulating the same, a. draft means attached to said shoe or screed, and a vibrating means comprising a motor having an unbalancing weight carried by said shoe or screed.

5. In a'machine for working concrete, the combination of an elongated shoe or screed adapted to be applied directly to and supported by a mass of concrete to be worked or to rest and be reciprocated upon forms for the concrete, a side plate projecting upwardly from the front edge of said screed or shoe, resilient handles attached to said shoe or screed at the ends thereof and projecting outwardly and upwardly therefrom for manually manipulating the same, and a vibrating means comprising a motor having an unbalancing weight carried by said shoe or screed.

6. In a machine for working concrete, the combination of an elongated shoe or screed adapted to be applied directly to and supported by a mass of concrete to be worked or to rest and be reciprocated upon forms for the concrete, handles attached to said shoe or screed at the ends thereof and projecting outwardly and upwardly therefrom for manually manipulating the same, and a vibrating means comprising a motor having an unbalancing weight carried by said shoe or screed.

'7. In a machine for working concrete, the combination of a hand shoe or screed adapted to be applied directly to and supported by a mass of concrete to be worked or to rest and be reciprocated upon forms for the concrete, a side plateprojecting upwardly from the front edge of said screed or shoe, and a vibrating means comprising a motor having anunbalancing' weight carried by said shoe or screed.

8. In a machine for working concrete, the combination of a hand shoe or screed adapted to be applied directly to and supported by a mass of concrete to be worked or to rest andbe reciprocated upon forms for the concrete, and a vibrating means comprising a. motor having an unbalancing weight carried by said shoe or screed.

CORWILL JACKSON. 

